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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6c548a519a140f38e2306abb1602e9d20f77597f3da9b416e6e39bbdb6fa70a' 
  AND token = 'GpeP2pQsCBPfpiHOrqQREAb10pj6ia6UgJIGPtn7c7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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