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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a508ad5d53a9bfdb0b06e92a2366f5d0dfee6b271e4190725987333924e5b5a0' 
  AND token = 'JBPFoL9//773ptaZIXpSh/PpdXBXI7LWkHiqSLz51DU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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