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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d091bc9b29995f43dc86c73cb265b15f0b7621f7b8cab2113c24c2db12b21ff' 
  AND token = 'h2bVy7gRSN4E8zppfwpLhkMHbiNNPYNGrrHppYlifB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}