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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67b160a4df0a806a0e579ab3a49a2d6072defb85421f009cb91b5b939f4d0dd8' 
  AND token = '7DfhAOfEP1wkClUzisRh3jMKaokfopr2rmMgfne8gUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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