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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94a48e8f324071c619fcf77ab9a8136d4f5a6caf4ab7605a2ad801d742c05ec0' 
  AND token = 'JnimVHhlhxLrkNY5+DTq6SUHvEfzY7HlaPNIkbl8DJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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