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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c55f5ebd51b0b1e673af521e20af80c8e86de538b03353076aea9d7dddb2db2' 
  AND token = 'WhRCNOGARnYSoVpvWxE42uvaG7+7ms3FLgdej+oDkC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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