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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6513822200f18c4a9cd0500226732358aa2e5cca62b5dbe8c863ca70f3e85dc1' 
  AND token = 'NTig8X2SuotbxDFXr5kA6qNTNB10QbVQxApoH5bUr90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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