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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29193d90a27b7262e8240707f739b9b99f8b244af2e4b042108bb28e8ff8bd7e' 
  AND token = '7Nqn+p0RNBMJBARcEbCDOFSnTvB/a36i0CDYMsYwXig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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