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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62287a095ffe3df22f250bea38fd9a8ec2a108f1d25676a2a562129d9d7a1177' 
  AND token = 'tgkIK9dslAzus/q2ZZXcJu6EH2/SLcOTPlQRKxngXX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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