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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfc70a0f0ec87e5129cc08f2c7eca057edb16538a48fc5fc03c3b10a3ed362b6' 
  AND token = 'y/cQpsN+QuPjLZIJXXhHqbf8T4470gli+XQ2R0nlXgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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