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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5b3441082487af2c1491df1a1b0211bba0f18a7ea3ce22be0530679ec118f02' 
  AND token = '0U95v/jJg32+Ml2PkCrqMbUmgB4ZlQ8fdyiYpGswvvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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