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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fabf859201a0040f8341c088b78913e4d5b58f3b1c277dc7b8f251d325d44ad6' 
  AND token = 'AgSbtLNNviPHfrO7yMGmE8+F+a3xaDJ89+e8z3glmHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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