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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccb23cb4561052553e376e5c7a4011d961fa17dd8d8742ee2cede405ea0c002b' 
  AND token = 'j8wAWaNzrk/ES51ZfsR723ZBZur09UN3DVDhpMwQG5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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