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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78dda8031c91f64113a8f10bc3f3d0e9ee919fec84ac10dfaee332b9ef43f674' 
  AND token = 'fmA6zhDA8gUlitkjFCAuwhQa9wksfu8gc6KXS1WvjYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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