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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0bc14b7abf00fbee5bcf585302f88787b93f27fe23d66d4cc814a5ebb103781' 
  AND token = 'eV2KvP+F2nzwt7ujq5IibIFmUiaXDmOaIPzd5j9rkU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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