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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4341ac33f91a248fdf1c5ea332bd8624ae4c4c1f45a3c4ef0181799032c337e' 
  AND token = 'ceBGERqoKL/rLpA68Acy5Eq0UJ+/tnfTmCyps+s5t20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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