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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea3a8dce843a40564fd90178797fe560ad609422f130e4fbe0f2ca837f0b8d00' 
  AND token = '0hXOjdXvVZJUoqXVi+rClJh5Fa24Qid7r3N9lm0iGPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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