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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf338ff71b36daf5967d9265f8a75994d632b99ca3b35a25541b905b347f4f9b' 
  AND token = 'o+2oFTOLpcQcMxUWcK2yL3PtLad0Vgf+JzBNtYaOtUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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