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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '132c6c871385f5787231477a394689e0c61008e12b9a8a0c5d417d340e8d3452' 
  AND token = 'EF7tXXIpUNpwXB4dTHkKzakgn3i5XGTdkrfdgnL7xe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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