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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf7837db0966924c68e73e6d0d515771f287560a7f8e92739b28ef0c6657d715' 
  AND token = 'd//CcKo88OHWg+Qw5WTGlw7m9M6KD9XeH/bMm879YQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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