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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '308bc63aafbf05ab1727b823eaac5b42b0c3dbf5f932ff4151403a7c63dd15be' 
  AND token = 'Rr0XL89/flMRKwajAJXqMbk1ey6kuGwhK0YV32TXwC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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