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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32186c9b3298c418aec9f1706c5f526becef4059fd9fc2784956012a63bf7dad' 
  AND token = 'c9xQKq+778b2cN3hxWiM1oo3Uz16ULlOtQiIqQUKlFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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