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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6631bfd27e473de4bbfb46ba538ab2ec45ea11e39f58448f2c55a5dc3aadd7c7' 
  AND token = '9dzrivD3wu3XNw16XoaIy3CdByKwSFRfaRj9lHDOy3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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