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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea43a3717f3829118c0c3d888d3da9131b3cea38f91ab7b40e1415c44944d3c2' 
  AND token = 'OlotZeVA5PkJLOyh/IymYSipclkoyr1+Kgq8gFVMoMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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