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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '949bf89d2adc08a003c6174618ceaa09057e16bf12d71e93350fe00d8b7a6d56' 
  AND token = 'o6tz2Q6aZWzjYLdTRVLNoHNUsXTYwAMRBM3AKixn+Qw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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