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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b3f63eeced9898bf586194cc729505488f437b19caafaa066d86af0893a6b14' 
  AND token = 'TTuaGVM0Ufg4GjkoFYL9qLN3MGWy4GcNEZJ9AMNeAK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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