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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96b2ab767543dee26cfad1f17511ff3597d710cd5e50a3cd6afd51c0bbef9ba0' 
  AND token = '1g8fykcTeHUHQLKhqR+A9zdH5vEhe5+6fnIV0Lf+Q8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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