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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '859b5619028f40fa4ffa1d78af9ff1ae9947ec4816073172e745e41c63ef3e58' 
  AND token = 'WvCvz5WQdyglKtMIQKe3YJGyDswAPN7l/mx5gC1SEIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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