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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9cb73604a9359e3525b55c6cde54f70e155b8c29aea6d351a9633168ca3e06e' 
  AND token = 'MdlJdAjLp9nn57ZD/KaxgLN30AiMXlDcC/goGm7U2O8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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