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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a37618b1344ca2f73fa9c435e6a40c46a7717b590ba4a71a520878039fd2629' 
  AND token = 'bt2tuLIWL9m7oBTU2kKEH020lrPctihP9xLpZT14kQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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