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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd396668fa2ec3d6641c8fe0e3695b326f9001f33c2fe31e871598446adc4adba' 
  AND token = 'oFMxeOdhwkorNu5x4moZswW37Cga4Fbq6Vdl3sT5GRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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