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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '703d8f73de98c06ac3be16106d25b242b81a2e58b89ae4ecd0140b9a7d96f2e6' 
  AND token = 'hNs08c0l0iaO2E4ZcCrnji5pOyHNp85PVoTrTzDKpR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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