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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db07947ae5c92d73b8b6e22206058797ac6f2c1587bf241fa94d42a7ccd49b0b' 
  AND token = '7ate42lZa19rZrbD3z4jhZF7Vn2iBbxkejdi2pVkRGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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