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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '929cf66bbeb3bd18af74b9863b49d6fb8604324e83602b295eac582a12d7b03c' 
  AND token = 'GMrEljHtbblLb0M2x8ivHzgaiee6cdKEWmxXZcTqqwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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