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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caed58d5475f791c8a6a2f91e1dc465aed0accd78ae55d35d006de7e0bc4d421' 
  AND token = 'wLoU5UA6MJrwnpYkBE3tva6G01ttVHKyOefNaXnJPDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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