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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd46d23c3062fb360fb6f1caecac1b911d49ad333709f16d587e3552d9997d9e' 
  AND token = 'EHh+QXqF+Xik/x5lY59Jj/3tcObrIfuXhwV6QY8M1yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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