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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d5afb3daa48a3892b186d40605bd72f4c136adfd19ea5a8cf6f26691939c8e7' 
  AND token = 'D+FjUaRtxDEhpprNwlQpM38GsEmWKMsKg9FQw+41/8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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