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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b3dcce4a494143265488ce3c0c866ec415358c6c8f255142c1bcd737cbdd641' 
  AND token = 'pgLCv3QwvtX8pDBpkL9Yx4a4Rs57ylNhvYgOS/en85w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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