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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f93e93f2bd319d6febfd8f30a0467106ab345767ae96d3a598b6166e43714a82' 
  AND token = 'ERmhymBrBl8FRrINgeGv/x4a00HJxzzBPoHKPcKJI0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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