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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3f029775dd4c96b12869c02c50ba1072d0816252df9a5c99ace4c9fd160a28a' 
  AND token = 'AbHoIXn05rXojMbdLhU1cowOakhKpKVhralJOtjCEWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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