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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7251239ec3e2a33d3eb7074a36e6a532c990966db15659f30dd0a9555e9a0c5' 
  AND token = 'EOTJZJGbpmnyxdh4dEijyqoa/vln8xI9B2EJWPZLx38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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