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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87c2474b174bf56fee69199c2edc07f248dd9d58e25acd4a2df307f2546dc167' 
  AND token = 'HADqP9qOHu5g5Ko/Vt55NM4fQ3Gc/13/GlzFgIhocI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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