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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '842e9e83e0513c9141e6c30af7e18f7a09f9c185aa6c88e14e8dfd34ea737554' 
  AND token = 'CcwJ+ll43NYiPjnxfZS9xlI/guLjyXTDP0Pdn3xiqV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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