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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f996f3ec2c7d30ecf2cfb401e0e5294405a9a36602246531b66fb29b08890e3c' 
  AND token = 'cZhctgPu750bNMO4FHUSYEo55h9ji9S87DhdWvOqEr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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