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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '275785e2ec86dca15826d0e6a5ec182b90d9fd53dbc19166d189b70de0f4e8d8' 
  AND token = 'jAuVqS9xYwHsNIDDMwCy7yqnUMY2m+CsslBJxH2XSQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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