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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eca29a1d1291a62fbb1236f89815c000994aa0ba7e3fbca63074346c54d29e77' 
  AND token = 'pY06nGvp5pn3vT5nK0OflWInEQfa5hwqzk13m92t7WM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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