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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '088c58b34085cba5c5e9075344bb4273df8f5732afbe6b8c06cbcdfd8fc206cf' 
  AND token = 'YqB/qz0pUinP4AaHX0C3C6aqFAQsqX+2gVM/m+fS/og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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