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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5a67d3281eb75b200fb18f0e39a05a10e55f55278ce0b85b6eba5479a2c54bb' 
  AND token = 'qGYXLOfGIaLoe40FYTovtsiLoG15ppKJVNGxGWez5mE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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