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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a67fdaec9938e42a77fad98ebb9c2f04d6ae193092250becd8b9858008b9917' 
  AND token = 'nR1yBdBrNwgKi0aqG9oPlJyJehePuvWJjjRirCkYzoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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