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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8e70571f5cf97b6b7156ec920fe5d414378cb90cc7858f72e68ca7aba90f6cb' 
  AND token = 'DJ0z+51IbAha+ry/5WW/pE1BtuJ4CQ1DMTQ9niVPF0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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